Devil in Disguise - John Wayne Gacy
Michael ChernusJohn Wayne Gacy
Gabriel LunaDet. Rafael Tovar
James Badge DaleChief of Detectives Joe Kozenczak
Michael AngaranoSam Amirante
Chris SullivanLead Prosecutor Bill Kunkle
Marin IrelandElizabeth Piest
Greg BrykHarold Piest
Cricket BrownKerry Piest
Ted DykstraDet. Allen Fanholm
Thom NyhuusKenneth Piest
Jake HorowitzDavid Cram
Hamish Allan-HeadleyDet. Michael Albrecht
Nina KiriMary Amirante
Chloe AvakianPatti Szyc
Sprague GraydenBessie Stapleton
Krista BridgesRosemarie Szyc
Michael EsperBob Motta
Augustus PrewJeffrey
Etienne KelliciSamuel Stapleton
Mason VersawRobert Donnelly
Alex Paxton-BeesleyHelen
Eva FooteCarol Gacy
Kristine NielsenMarion Gacy- LLena PepeJuanita
Christian BakoMarko Butkovich
Jim AnnanJudge Louis Garippo
Mallory BechtelMary Jane
Ryker BalounRobert Piest
Finlay Wojtak-HissongRandy Reffett- RRobert MeynellDonald Voorhees Sr.
Andrew JohnstonDonald Voorhees Jr- JJoshua KilimnikTeenage Gacy
Max MatternBilly Carroll- BBrayden RaqueñoDale Landingin
Lynne GriffinGladys
Desmond SivanFred Tovar- LLevi SheltonJohn 'Johnny' Szyc
- TTom BarnettRichard Szyc
Mitchell CourtEldest Szyc Son
Yona Epstein-RothCliff
Rolando Alvarez GiacomanJanitor
Megan MurphyLynn Meadows
Mary WisemanKaren Gacy
Dan LettDr. Stein- SSamantha AdamsMarlynn Gacy
Brenda BazinetEugenia Godzik- JJessie BehanYoung Marion Gacy
Kathryn BellamyBeth
Quincy Tyler BernstineDr. Healy
Alec DahmerRookie Cop
Colton RyanBilly Kindred
Nigel Shawn WilliamsJohn Davis
Ianne Fields StewartSophia St. Laurent
Ish MorrisGuard Jenkins- LLizzie MoffattYoung Woman 1
- AAidan PinslerYoung Male
- AAmanda CheungHot Girl
- MMatthew ChiarelliDelivery Man 1
- MMira Skye KorngoldWaitress
Sam WexlerDelivery Man 2
Gavin LewisTimothy McCoy
Crede CooperJohn Butkovich
Thomas Mitchell BarnetPhil Torf
Alexander CrowtherDetective Janus
Christopher JacotDetective Everford- JJarrod VanvolkenburgJerry Latherow
Aidan Wojtak-HissongRandy Reffett
Cameron BrodeurMichael Rossi
Brandon McEwanPhilip Paske
Luke HumphreyTerry Sullivan
Aidan GouveiaGreg Godzik
Rayisa KondrackiGeraldine
Daniel GriffinCharlie Reynolds
Dwight IrelandPress Conference Reporter
E. Fegan DeCordovaReporter- KKarrie KwongReporter
Ella Rae PeckRose Perino
R Austin BallRon Dovenek
Morgan KellyFred Richman
Dylan TaylorCPD Officer O'Neal
Lauren CollinsGenie Godzik
Kylee EvansDeanna Amirante
Marcia BennettDelores Nieder
Eric WiegandDanny Jockell
Abigail NicholsonGirl with Acid
Igby RigneyPhil